Allow Offline MHTML save operations to succeed even with missing frames.

chrome/browser/android/offline_pages/offline_page_mhtml_archiver.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/offline_pages/offline_page_mhtml_archiver.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 116 matching lines @@
   // the end of MHTML generation. Perhaps we should pull it out after the MHTML
   // is generated.
   GURL url(web_contents_->GetLastCommittedURL());
   base::string16 title(web_contents_->GetTitle());
   base::FilePath file_path(
       archives_dir.Append(
           GenerateFileName(url, base::UTF16ToUTF8(title), archive_id)));
 
   content::MHTMLGenerationParams params(file_path);
   params.use_binary_encoding = true;
+  params.ignore_missing_frames = true;
 
   web_contents_->GenerateMHTML(
       params,
       base::Bind(&OfflinePageMHTMLArchiver::OnGenerateMHTMLDone,
                  weak_ptr_factory_.GetWeakPtr(), url, file_path, title));
 }
 
 void OfflinePageMHTMLArchiver::OnGenerateMHTMLDone(
     const GURL& url,
     const base::FilePath& file_path,
@@ skipping 24 matching lines @@
 }
 
 void OfflinePageMHTMLArchiver::ReportFailure(ArchiverResult result) {
   DCHECK(result != ArchiverResult::SUCCESSFULLY_CREATED);
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback_, this, result, GURL(), base::FilePath(),
                             base::string16(), 0));
 }
 
 }  // namespace offline_pages